1. The government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory
   - Security Service [Brit], Military Intelligence Section 5 [Brit]

Type of: international intelligence agency

• chromatography column
• chromatophore
• chrome
• chrome alum
• chrome green
• chrome red
• chrome yellow
• chrome-nickel steel
• chrome-tungsten steel
• chromesthesia
• chromic
• chromic acid
• chromite
• chromium
• chromium steel
• chromium-plate
• chromo
• chromoblastomycosis
• chromogen
• chromogenic
• chromolithograph
• chromolithography
• chromophore
• chromoplast
• chromosomal